Guerrero, Josep M.

Wang, Wen

Wei, Baoze

Yan, L.

Zeng, X.

Zhao, Xin

English

The asymmetry of the inherent distributed capacitances causes the rise of neutral-to-ground voltage in ungrounded system or high resistance grounded system. Overvoltage may occur in resonant grounded system if Petersen coil is resonant with the distributed capacitances. Thus, the restraint of neutral-to-ground voltage is critical for the safety of distribution networks. An active grounding system based on single-phase inverter is proposed to achieve this objective. Relationship between output current of the system and neutral-to-ground voltage is derived to explain the principle of neutral-to-ground voltage compensation. Then, a current control method consisting of proportional resonant (PR) and proportional integral (PI) with capacitive current feedback is then proposed to guarantee sufficient output current accuracy and stability margin subjecting to large range of load change. The performance of the control method is presented in detail. Experimental results prove the effectiveness and novelty of the proposed grounding system and control method

Control Method of Single-phase Inverter Based Grounding System in Distribution Networks

https://vbn.aau.dk/ws/files/244530636/ECCE_2016_Control_Method_of_Single_phase_Inverter_Based_Grounding_System.._.pdf

Control Method of Single-phase Inverter Based Grounding System in Distribution Networks

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